Table 2 Direct and total effects of each driver on ACSP in the U.S. and global models.

Total effects are calculated as the sum of the direct and indirect effects of the predictor on the response variable.

SEM model	Predictor	Response	Direct	Total effect
U.S. model	Water temperature	ACSP	0.39	0.39
	30-day consecutive flow	ACSP	0.28	0.28
	Precipitation	ACSP		0.18
	Air temperature	ACSP		0.36
	Impervious cover	ACSP		0.02
	Watershed area	ACSP		0.16
	Mean elevation	ACSP		−0.10
	Absolute latitude	ACSP		−0.01
	Forest cover	ACSP		−0.08
Global model	Absolute latitude	ACSP	0.35	0.19
	Air temperature	ACSP		0.38
	Mean elevation	ACSP		−0.19
	Precipitation	ACSP		0.05
	Water temperature	ACSP	0.47	0.47